Author [NL] [FR] [ES] [DE] [SE] [IT] Topic: final drive failure symptoms?  (Read 5017 times)

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  • Offline janfmiller   us

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    Offline janfmiller

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    final drive failure symptoms?
    on: May 16, 2017, 04.10 am
    May 16, 2017, 04.10 am
    72000 miles on my 2013 TTSE.  I hear a whump-whump-whump sort of sound at about 40 miles per hour from the final drive area.  After a long ride in 80-degree temperatures the Final drive is very hot on the exterior, but not so hot you have to pull your fingers away. Checking for play by grasping the edges of the wheel, I seem to feel a very small bit of rocking play, just a tiny bit. I drained the oil and there was no debris on the magnet of any sort, just the normal tiny bit of sludge, the oil was very clean. 
    I'm in ex-R1150RT BMW owner, experienced two failed final drives on that machine so maybe just a bit gun shy.  Can anyone verify this is either normal, or a problem.?
    1977 Suzuki TS-185
    1974 Kawasaki Z-1 903
    2021 Honda Africa Twin Adventure Sports ES NON-DCT

  • Offline 1675   gb

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    Offline 1675

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    Re: final drive failure symptoms?
    Reply #1 on: May 16, 2017, 08.57 am
    May 16, 2017, 08.57 am
    Could the sound you describe be (necessary) backlash in the drive train? I note my bike is not as quiet in this area as my previous shaft driven bike. Try doing 40mph in 3rd gear to see if the noise goes away. The higher revs of the engine in the lower gear will take up the backlash but the rear drive is still turning at the same speed.

  • Offline janfmiller   us

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    Offline janfmiller

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    Re: final drive failure symptoms?
    Reply #2 on: May 16, 2017, 02.43 pm
    May 16, 2017, 02.43 pm
    Good advice, but that's not it, sound Remains the Same in any gear, also is there if I pull in the clutch and coast in neutral.  It's loud enough to notice at 40 miles per hour when not accelerating
    1977 Suzuki TS-185
    1974 Kawasaki Z-1 903
    2021 Honda Africa Twin Adventure Sports ES NON-DCT

  • Offline NavyDad

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    Re: final drive failure symptoms?
    Reply #3 on: May 17, 2017, 02.03 am
    May 17, 2017, 02.03 am
    Jan, I'm thinking universal joint more than rear drive failure. My buddies 1200RT was doing the "whump, whump" and it was a U-joint failing.

  • Offline RocketSteve   gb

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    Offline RocketSteve

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    Re: final drive failure symptoms?
    Reply #4 on: May 17, 2017, 10.07 am
    May 17, 2017, 10.07 am
     :460:

    That UJ near the gearbox does look very exposed and vulnerable so maybe that could be the problem... is that the one you mean?

    Edit: Just checked my back wheel and there's no play whatsoever in the bearing.
    Last Edit: May 17, 2017, 10.10 am by RocketSteve
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  • Offline earthman   gb

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    Re: final drive failure symptoms?
    Reply #5 on: May 17, 2017, 01.19 pm
    May 17, 2017, 01.19 pm
    I'm wondering if a rubber boot of some sort could be placed over that UJ,...I noticed how exposed it were too.

  • Offline 1675   gb

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    Offline 1675

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    Re: final drive failure symptoms?
    Reply #6 on: May 17, 2017, 08.43 pm
    May 17, 2017, 08.43 pm
    I seem to remember some folk have fitted the rubber boot from the Explorer and it has been detailed here. Why it isn't on the Trophy is anyones guess

  • Offline janfmiller   us

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    Offline janfmiller

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    Re: final drive failure symptoms?
    Reply #7 on: May 17, 2017, 08.44 pm
    May 17, 2017, 08.44 pm
    *Originally Posted by RocketSteve [+]
    :460:

    That UJ near the gearbox does look very exposed and vulnerable so maybe that could be the problem... is that the one you mean?

    Edit: Just checked my back wheel and there's no play whatsoever in the bearing.

    U-joint appears to be ok, checked it when I adjusted the shifter lever about 6 weeks ago.  There is kind of a splash guard over it, anyway, automobiles have totally exposed u-joints and they last indefinitely.  Did have one fail on my BMW R1150RT, but a LOT of things failed on that disappointment...
    I'm going to check the play again and try to see if it's in the final drive or the rear bushings. However, the bushings would not cause the noise I'm hearing.  Then again, I suppose it 'could be' the tire, I mounted Avon Storm ST XM 7000 miles ago, never ran them before. 
    When I worked for the railroad we used to 'run 'em until they self-diagnose' ( i.e. explode )...
    Keeping a watchful eye...  :156:
    1977 Suzuki TS-185
    1974 Kawasaki Z-1 903
    2021 Honda Africa Twin Adventure Sports ES NON-DCT